Phase-Difference Autofocus Sensor Proximity Sensing
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Solution Overview
Problem
Conventional electronic devices with embedded proximity sensors face challenges such as increased manufacturing costs, limited component mounting space, and complex front designs due to the need for separate holes for light emitting and receiving units.
Innovation Solution
Implementing a phase-difference autofocus sensor to determine proximity by analyzing the phase difference in images acquired through the device's lens, eliminating the need for a dedicated proximity sensor and allowing for proximity sensing without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical proximity sensor is embedded in the electronic device, then proximity sensing function is achieved, but manufacturing cost increases and component mounting space is limited
Solution Approach 1:
The phase-difference autofocus sensor is designed to perform dual functions: traditional autofocus operation and proximity sensing. By analyzing phase difference data from the autofocus sensor, the device can determine both focus distance and proximity status without requiring a separate proximity sensor, thereby reducing component count and manufacturing cost while maintaining proximity sensing capability
Solution Approach 2:
The patent combines the proximity sensing function with the existing phase-difference autofocus sensor by merging the light receiving units and signal processing pathways. The same sensor array and processing circuitry used for autofocus are utilized to detect proximity by analyzing phase difference magnitudes, eliminating the need for separate proximity sensor hardware
2Reliability
If separate holes are formed for light emitting unit and light receiving unit of proximity sensor, then proximity sensing function is achieved, but front design becomes complex
Solution Approach 1:
The patent merges the proximity sensing optical path with the camera optical path by using the same lens and image sensor for both photography and proximity detection. The phase-difference autofocus sensor shares the main lens aperture, eliminating the need for separate proximity sensor holes and simplifying the front panel design to require only the camera opening
Solution Approach 2:
The main camera lens and image sensor serve multiple functions: capturing images, performing autofocus, and enabling proximity sensing. This multi-functional design eliminates the need for dedicated proximity sensor apertures, reducing the number of holes required in the front surface and simplifying overall device design
3Reliability
If optical proximity sensor is used, then proximity sensing function is achieved, but component mounting space is limited
Solution Approach 1:
The patent combines the proximity sensing function with the existing camera module by merging the optical paths and signal processing circuits. The phase-difference autofocus sensor uses the same light receiving elements and processing circuitry as the main camera, eliminating the need for separate proximity sensor components and freeing up mounting space
Solution Approach 2:
The patent extracts the proximity sensing capability from a separate dedicated sensor and integrates it into the existing phase-difference autofocus sensor system. By taking out the proximity detection function and combining it with autofocus processing, the design eliminates redundant components and optimizes space utilization within the camera module
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces manufacturing costs, conserves component mounting space, and simplifies the device design while maintaining effective proximity sensing functionality.
Implementation Method 1
confirming a phase difference regarding a corresponding subject of an image acquired through a lens of the electronic device by operating a phase-difference autofocus sensor
Data Source
AI summary
A method for sensing proximity by an electronic device is provided. The method includes confirming a phase difference regarding a corresponding subject of an image acquired through a lens of the electronic device by operating a phase-difference autofocus sensor and determining that the corresponding subject is proximate to the electronic device when the confirmed phase difference is larger than a designated first reference value.